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WO2008106518A2 - Scr sur substrats de filtre de faible masse thermique - Google Patents

Scr sur substrats de filtre de faible masse thermique Download PDF

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Publication number
WO2008106518A2
WO2008106518A2 PCT/US2008/055138 US2008055138W WO2008106518A2 WO 2008106518 A2 WO2008106518 A2 WO 2008106518A2 US 2008055138 W US2008055138 W US 2008055138W WO 2008106518 A2 WO2008106518 A2 WO 2008106518A2
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WO
WIPO (PCT)
Prior art keywords
filter
molecular sieve
wall flow
fibers
fiber matrix
Prior art date
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PCT/US2008/055138
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English (en)
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WO2008106518A3 (fr
Inventor
Samuel Boorse
Joseph Dettling
Original Assignee
Basf Catalysts Llc
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Filing date
Publication date
Application filed by Basf Catalysts Llc filed Critical Basf Catalysts Llc
Priority to EP08730850A priority Critical patent/EP2117681A4/fr
Priority to JP2009551820A priority patent/JP5592653B2/ja
Priority to CN2008800137327A priority patent/CN101674876B/zh
Publication of WO2008106518A2 publication Critical patent/WO2008106518A2/fr
Publication of WO2008106518A3 publication Critical patent/WO2008106518A3/fr

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    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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    • B01J29/06—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
    • B01J29/70—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of types characterised by their specific structure not provided for in groups B01J29/08 - B01J29/65
    • B01J29/72—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of types characterised by their specific structure not provided for in groups B01J29/08 - B01J29/65 containing iron group metals, noble metals or copper
    • B01J29/723—CHA-type, e.g. Chabazite, LZ-218
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    • B01D39/00—Filtering material for liquid or gaseous fluids
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Definitions

  • NO x nitrogen oxides
  • exhausted gases such as from internal combustion engines (e.g., automobiles and trucks), from combustion installations (e.g., power stations heated by natural gas, oil, or coal), and from nitric acid production plants.
  • the SCR process uses catalytic reduction of nitrogen oxides with ammonia in the presence of atmospheric oxygen with the formation predominantly of nitrogen and steam:
  • a diesel engine exhaust contains phase materials (liquids and solids) which constitute particulates or particulate matter as well as NO x .
  • catalyst compositions and substrates on which the compositions are disposed are provided in diesel engine exhaust systems to convert certain or all of these exhaust components to innocuous components.
  • diesel exhaust systems can contain one or more of a diesel oxidaltion catalyst, a soot filter, and a catalyst for the reduction OfNO x .
  • the particulate matter emissions of diesel exhaust contain three main components. O ⁇ e component is a solid, dry, solid carbonaceous fraction or soot fraction. This dry carbonaceous matter contributes to the visible soot emissions commonly associated with diesel exhaust.
  • a second component of the particulate matter is a soluble organic fraction ("SOF").
  • the soluble organic fraction is sometimes referred to as a volatile organic fraction ("VOF").
  • the VOF can exist in diesel exhaust either as a vapor or as an aerosol (fine droplets of liquid condensate) depending on the temperature of the diesel exhaust.
  • the VOF arises from two sources: (1) lubricating oil swept from cylinder walls of the engine each time the pistons go up and down; and (2) unburned or partially burned diesel fuel.
  • a third component of th ⁇ particulate matter is a sulfate fraction.
  • the sulfate fraction is formed from small quantities of sulfur components present in the diesel fuel.
  • SO 3 Small proportions Of SO 3 are formed during combustion of the diesel, which in turn combines rapidly with water in the exhaust to form sulfuric acid.
  • the sulfuric acid collects as a condensed phase with the particulates as an aerosol, or is adsorbed onto the other particulate components, and thereby adds to the mass of total particulate matter.
  • the subject innovation described herein relates to selective catalytic reduction (SCR) filters that effectively provide simultaneous treatment of particulate matter and NO x .
  • the subject innovation also relates to emission treatment systems and emission treatment methods that involve the SCR filter.
  • the SCR filter can include a fiber matrix wall flow filter comprising a plurality of non-woven inorganic fibers and a chabazite molecular sieve SCR catalyst on the fiber matrix wall flow filter.
  • the subject innovation also relates to methods for reducing NO x concentration and particulate matter in a diesel engine exhaust.
  • the method involves injecting ammonia or an ammonia precursor a diesel engine exhaust, and passing the exhaust through a SCR filter containing a fiber matrix wall flow filter and a chabazite molecular sieve SCR catalyst on the fiber matrix wall flow filter, the fiber matrix wall flow filter containing a plurality of non-woven inorganic fibers.
  • Figure IA is a perspective view of a fiber matrix wall flow filter in accordance with one aspect of the specification.
  • Figure IB is a cutaway view of a portion of a fiber matrix wall flow filter in accordance with one aspect of the specification.
  • Figures 2A and 2B are schematic diagrams illustrating systems for treating an exhaust stream containing NO x and particulate matter in accordance with one aspect of the specification.
  • Figure 3 is a flow diagram of an exemplary methodology for reducing
  • the subject innovation described herein relates to selective catalytic reduction (SCR) filters, emission treatment systems, emission treatment methods that effectively provide simultaneous treatment of particulate matter and NO x .
  • Integration of NO x reduction and particulate removal functions into a single catalyst article can be accomplished by using a fiber matrix wall flow filter coated with a chabazite molecular sieve SCR catalyst.
  • the emission treatment system uses an integrated soot filter and SCR catalyst to significantly minimize the weight and volume required for the emissions system.
  • effective pollutant abatement can be provided for exhaust streams of varyirjg temperatures. This feature is advantageous for operating diesel engines under varying loads and engine speeds which have a significant impact on exhaust temperat ⁇ res emitted from the engines.
  • the subject innovation can be used in an application where high filtration efficiency is required.
  • the SCR filter is suitable for effectively removing particulate matter in emission treatment systems.
  • the combination of a fiber matrix wall flow filter and a chabazite molecular sieve SCR catalyst disclosed herein allows wall flow substrates to be loaded with practical levels of the SCR catalyst without ⁇ ausing excessive back pressure across the coated filter when implemented in emission treatment systems.
  • the filter contains fused fiber bundles to form a wall flow depth filter.
  • the fiber matrix wall flow filter can contain a plurality of non-woven inorganic fibers.
  • the non-woven inorganic fibers can be any suitable fiber as long as the fibers can have thermal tolerance under emission treatment processes.
  • the non- woven inorganic fibers can have one or more properties of a high melting point, low heat conductance, low coefficient of thermal expansion, ability to withstand thermal and vibrational shock, low density, and high porosity and permeability.
  • the fiber matrix wall flow filter containing the non-woven inorganic fibers can have one or more properties of a high melting point, low heat conductance, low coefficient of thermal expansion, an ability to withstand thermal and vibrational shock, a low density, a high porosity, and a high permeability.
  • non- woven inorganic fibers include alumina fibers, silica fibers, mullite fibers, silicon carbide fibers, aluminosilicate fibers, aluminum borosilicate fibers, or the like.
  • the alumina fibers typically contain about 95 wt. % or more and about 97 wt. % or less of alumina and about 3 wt. % or more and about 5 wt. % or less of silica in a fibrous form.
  • the alumina fibers can be produced by extruding or spinning a solution of precursor species.
  • the silica fibers typically contain about 90 wt. % or more of amorphous silica with low impurity levels.
  • silica fibers has a low density (e.g., about 2.1 g/cm or more and about 2.2 g/cm 3 or less), high refractoriness (about 1600 degrees Celsius), low thermal conductivity (about 0.1 W/m-K), and near zero thermal expansion.
  • the aluminosilicate fibers typically contain about 40 wt. % or more and about 80 wt. % or less of alumina, about 5 wt. % or more and about 25 wt. % or less of silica, and about 0 wt. % or more and about 20 wt. % of iron or magnesium oxides
  • the aluminum borosilicate fibers typically contain about 40 wt. % or more and about 80 wt. % or less of alumina, about 5 wt. % or more and about 25 wt. % or less of silica, and about 1 wt. % or more and about 30 wt. % of boric oxide or boron oxide.
  • the details of the aluminum borosilicate fibers can be found in, for example, U.S. Patent No. 3,795,524, which is hereby incorporated by reference.
  • the fibers can have any suitable average fiber diameter for forming the monolithic hpneycomb structure of the fiber matrix wall flow filter.
  • the fibers have about 0.5 microns or more and about 50 microns or less of average fiber diameter. In another embodiment, the fibers have about 0.7 microns or more and about 30 microns or less of average fiber diameter. In yet another embodiment, the fibers have about 1 micron or more and about 20 microns or less of average fiber dialmeter.
  • the fibers can have any suitable average tensile strength for forming the monolithic honeycomb structure of the fiber matrix wall flow filter.
  • the fibers have an average tensile strength greater than about 700 MPa (100,000 psi). In another embodiment, the fibers have an average tensile strength greater than about 1 ,200 MPa (200,000 psi). In yet another embodiment, the fibers have an average tensile strength greater than about 1,800 MPa (300,000 psi). In still yet another embodiment, the fibers have an average tensile strength greater than about 2,100 MPa (350,000 psi).
  • the fiber matrix wall flow filter can contain alumina fibers, silica fibers, mullite fibers, silicon carbide fibers, aluminosilicate fibers, aluminum borosilicate fibers, or the like at suitable weight percentage.
  • the inorganic fiber portion of the filter contains from about 50 wt. % or more to about 90 wt. % or less of silica fibers, from about 5 wt. % or more to about 50 wt. % or less of alumina fibers, and from about 10 wt. % or more to about 25 wt. % or less of aluminum borosilicate fibers.
  • the fiber matrix wall flow filter further contains additives such as binding agents and thickening agents.
  • additives such as binding agents and thickening agents.
  • Organic binders and inorganic binders such as boron binders (e.g., boron nitride) can be added.
  • boron nitride can be added to replace aluminum borosilicate fibers.
  • the filtetr contains silica fiber, alumina fiber, and boron nitride in similar weight percentage as described above.
  • the filter contains low density fused fibrous ceramic composites prepared from amorphous silica and/or alumina fibers with about 2 to about 12 % boron nitride fibers by weight.
  • the details of the low density fused fibrous ceramic composites can be found in, for example, U.S. Patent No. 5,629,186, which is hereby incorporated by reference.
  • the fiber matrix wall flow filter can have a relatively low thermal mass, which in tilirn can contribute to faster heating and shorter light-off times. Since the fiber matrix wall flow filter can be quickly heated to the catalyst activation temperature, catalysts on the filter can quickly begin to convert NO x in the exhaust gas into N 2 .
  • the fiber matrix wall flow filter can have a low coefficient of thermal expansion between about 200 degrees Celsius and about 800 degrees Celsius (CTE 200-800).
  • CTE 200-800 the filter with or without a coating of a SCR catalyst has a CTE 200-800 of about 1 x 10 "6 /degree Celsius or more and about 6 x 10 "6 /degree Celsius or less.
  • the filter with or without a coating of a SCR catalyst has a CTE 200-800 of about 2 x 10 '6 /degree Celsius or more and about 4.5 x 10 "6 /degree Celsius or less.
  • the filter with or without a coating of a SCR catalyst has a CTE 200-800 of about 3 x 10 "6 /degree Celsius or more and about 4 x 10 "6 /degree Celsius or less.
  • the fiber matrix wall flow filter can also have a low coefficient of thermal expansion between about 900 degrees Celsius and about 500 degrees Celsius (CTE 900-500).
  • the filter with or without a coating of a SCR catalyst has a CTlE 900-500 of about 200 ppm or more and about 1500 ppm or less.
  • the filter with or without a coating of a SCR catalyst has a CTE 900-500 of jabout 300 ppm or more and about 1000 ppm or less.
  • the filter with or without a coating of a SCR catalyst has a CTE 900-500 of about 350 ppm or more and about 500 ppm or less.
  • the fiber matrix wall flow filter can have an elastic or Young's modulus, Emod.
  • the Emod of the wall flow filter can be measured at room temperature or at elevated temperature from 200 to 1000 °C, for example.
  • the room temperature Emod values can range from about 0.9 to about 1.2 Mpsi for an uncoated fiber wall flow filter material.
  • the fiber filter material can have a room temperature Emod value of about 0.8 to about 1.4 when coated.
  • the fiber matrix wall flow filter can have a modulus of rupture strength (MOR).
  • MOR modulus of rupture strength
  • the filter with or without a coating of a SCR catalyst has a MOR of about 1 ,000 psi or more and about 2,000 psi or less when measured at room temperature in a typical four point bending test in a manner similar to ASTM C 1 161 -02c.
  • the filter with or without a coating of a SCR catalyst has a MOR of about 1,000 psi or more and about 1 ,800 psi or less.
  • the filter with or without a coating of a SCR catalyst has a MOR of about 1 ,000 psi or more and about 1,500 psi or less.
  • the fiber matrix wall flow filter can have a thin porous walled honeycomb structure through which a fluid stream passes without causing a great increase in back pressure or pressure across the filter.
  • the filter can have any suitable honeycomb cell density.
  • the honeycomb cell density is about 100 cell/in 2 or more and about 400 cell/in 2 or less.
  • the honeycomb cell density of the filter is about 200 cell/in 2 or more and about 300 cell/in 2 or less.
  • the honeycomb cell shape can be square, triangle, round, oval, pentagonal, Hepa, doughnut, or the like.
  • the inlet channel can be larger than outlets to reduce backpressure generation and ash storage capacity.
  • the wall thickness of the honeycomb structure can be about 10 mils or more and about 40 mils or less.
  • the wall thickness of the honeycomb structure can be about 20 mils or more and about 30 mils or less.
  • the porosity of the wall of the honeycomb structure can be about 60 % or more and about 90 % or less. In another embodiment, the porosity of the wall of the honeycomb structure is about 70 % or more and about 85 % or less. In yet another embodiment, the porosity of the wall of the honeycomb structure is about 55 % or more and about 70 % or less.
  • the pore size can be about 15 microns or m ⁇ re and about 100 microns or less. In one embodiment, the pore size can be about 15 microns or more and about 30 microns or less.
  • any fiber matrix wall flow filter having the above mentioned properties can be suitable for use in the practices of the subject innovation.
  • Specific examples of such fiber matrix wall flow filter can be found in, for example, U.S. Patent Application Publication Nos. 2004/0079060, 2005/0042151, 2006/0120937, 2007/0104621, 2007/0104622, 2007/0104620, 2007/0151799, 2007/0151233, 2007/0107395, 2007/0152364, 2007/0111878, 2007/0141255, 2007/0107396, 2007/0110645, 2007/0108647, 2007/0220871, 2007/0207070, and 2007/0104632, which are hereby incorporated by reference.
  • a molecular sieve can be zeolitic— zeolites— or non-zeolitic, and zeolitic and non-zeolitic molecular sieves can have the chabazite crystal structure, which is also referred to as the CHA structure by the International Zeolite Association.
  • Zeolitic chabazite include a naturally occurring tectosilicate mineral of a zeolite group with approximate formula: (Ca 5 Na 25 K 25 Mg)Al 2 Si 4 Oi 2 -OH 2 O (e.g., hydrated calcium aluminum silicate).
  • Three synthetic forms of zeolitic chabazite are described in "Zeolite Molecular Sieves," by D. W.
  • SSZ-13 typically contains a silica to alumina molar with a ratio of about 8 to about 50. The molar ratios can be adjusted by varying the relative ratios of the reactants in the synthesis mixture and/or by treating the zeolite with chelating agents or acids to remove aluminum from the zeolite lattice. The crystallization of SSZ-13 can be accelerated and the formation of undesirable contaminants can be reduced by adding seeds of SSZ-13 to the synthesis mixture.
  • Chabazite molecular sieves can be hydrophobic.
  • Hydrophobic chabazite molecular sieve means that the chabazite molecular sieve is hydrophobic in and of itself, or that the chabazite molecular sieve is a hydrophilicchabazite molecular sieve that is rendlered hydrophobic by application of an outer coating of a suitable hydrophobic wetting agent (e.g., the particulate material has a hydrophilic core and a hydrophobic outer surface).
  • chabazite molecular sieves can be made hydrophobic by contact with hydrophobic wetting agents. Any suitable mineral applications, especially in organic systems such as plastic composites, films, organic coatings, or rubbers, can be employed to render the chabazite molecular sieve surface hydrophobic. The details of the mineral applications are described in, for example, Jesse Edenbaum, Plastics Additives and Modifiers Handbook, Van Nostrand Reinhold, New York, 1992, pages 497-500, which is hereby incorporated by reference for teachings of surface treatment materials and their application. [0043] General examples of surface treatment materials include coupling agents such as fatty acids and silanes.
  • hydrophobic agents include: organic titanates such as Tilcom® obtained from Tioxide Chemicals; organic zirconate or alunjiinate coupling agents obtained from Kenrich Petrochemical, Inc.; organofunctional silanes such as Silquest® products obtained from Witco or Prosil® products obtained from PCR; modified silicone fluids such as the DM-Fluids obtained from Shin Etsu; and fatty acids such as Hystrene® or Industrene® products obtained from Witco Corporation or Emersol® products obtained from Henkel Corporation.
  • fatty acids and salts thereof e.g., stearic acid and stearate salts
  • stearic acid and stearate salts are employed to render a particle surface of chabazite molecular sieves hydrophobic.
  • the hydrophobicity refers to the physical property of a surface of the chabazite molecular sieve to dislike or repel water. Hydrophobicity can be described by using contact angle measurements.
  • the contact angle is defined by equilibrium forces that occur when a liquid sessile drop is placed on a smooth surface.
  • the tangent to the surface of the convex liquid drop at the point of contact among the three phases, solid (S) 1 liquid (L), and vapor (V) is the contact angle ⁇ .
  • Dynamic contact angle measurements provide both an advancing and receding contact angles.
  • the advancing contact angle is a measurement of the surface hydrophobicity upon initial contact with a liquid, while the receding contact angle measures the hydrophobicity after the surface has been wetted with a liquid.
  • "hydrophobic" or "hydrophobicity” when used in reference to chabazite molecular sieve, chabazite molecular sieve particles have an advancing and/or receding contact angle of about 90 degrees or more, In another embodiment, chabazite molecular sieve particles have an advancing and/or receding contact angle of about 100 degrees or more.
  • chabazite molecular sieve particles have an advancing and/or receding contact angle of about 1 10 degrees or more. In still yet another embodiment, chabazite molecular sieve particles have an advancing and/or receding contact angle of about 120 degrees or more.
  • chabazite molecular sieve particles have a receding contact angle of about 90 degrees or more. In another embodiment, chabazite molecular sieve particles have a receding contact angle of about 100 degrees or more, In yet another embodiment, chabazite molecular sieve particles have a receding contact angle of about 1 10 degrees or more. In still yet another embodiment, chabazite molecular sieve particles have a receding contact angle of about 120 degrees or more.
  • the dynamic contact angles are based on a gravimetric principle of the Wilhelmy plate technique and are determined by measurement on a Dynamic Contact Angle Instrument which can measure both advancing and receding contact angles of powdejred samples.
  • a dynamic contact angle analysis system (model DCA 315) from ATI Cahn Instruments Inc. can be used for contact angle measurements.
  • the surface tension ( ⁇ ) of deionized water is determined with a standard platinum calibration plate.
  • Powder samples are deposited on dual sided adhesive tape.
  • the perimeter (p) of the tape is determined with a caliper.
  • the impregnated tape is placed in the DCA 315 and lowered and raised in the deionized water at a rate of 159 microns/second for two immersion cycles.
  • the contact angles can be determined from the advancing and receding wetting hysteresis curves of the first immersion cycle.
  • Chabazite molecular sieves in the subject innovation can be ion exchanged chab ⁇ zite molecular sieves.
  • Cations of the ion exchanged chabazite molecular sieve can be any suitable metal cation. Examples of metal cations include a transition metal selected from the group consisting of copper, chromium, iron, cobalt, nickel, iridium, cadmium, silver, gold, platinum, manganese, and mixtures thereof.
  • Resulting ion exphanged chabazite molecular sieve can be Cu-exchanged chabazite molecular sieve, Fe-exchanged chabazite molecular sieve, or the like.
  • the degree of desired ion exchange is not narrowly critical.
  • Chabazite mole ⁇ ular sieves can be exchanged with such a cation to a point at which the exchanged cation represents any suitable ratio of exchanged ions to Al cations.
  • ion-exchanged chabazite molecular sieve contains about 0.3 exchanged ions to Al atomic ratio or more.
  • ion-exchanged chabazite molecular sieve contains about 0.6 exchanged ions to Al atomic ratio or more.
  • ion-exchanged chabazite molecular sieve contains about 0.7 exchanged ions to Al atomic ratio or more.
  • ion-exchanged chabazite molecular sieve contains about 0.8 exchanged ions to Al atomic ratio or more.
  • the ion-exchanged chabazite molecular sieve can be formed by exchanging cations of a precursor chabazite molecular sieve with other cations. Exchanging cations can be achieved in any suitable technique such as immersion techniques.
  • a precursor chabazite molecular sieve can be immersed into a solution containing soluble salts of metal species. The pH of the solution can be adjusted by addition of amm ⁇ nium hydroxide, to induce precipitation of the metal cations onto the precursor chabazlite molecular sieve.
  • a precursor chabazite molecular sieve is immersed in a solution containing a soluble salt, e.g., copper nitrate, for a time sufficient t ⁇ allow the incorporation of the copper cations into the precursor chabazite molecular sieve by ion exchange, and then ammonium hydroxide is added to incorporate the copper ions in the solution onto the precursor chabazite molecular sieve by precipitation.
  • the chabazite molecular sieve can then be washed, dried, and calcined.
  • chabazite molecular sieve particles in the subject innovation can be finely divided particulate materials.
  • the term "finely divided” when utilized herein means that the particulate materials have a median individual particle size of about 10 microns or less.
  • chabazite molecular sieve particles have a particle size distribution wherein at least about 90% by weight has a particle siae of about 10 microns or less.
  • chabazite molecular sieve particles have a particle size distribution wherein at least about 90% by weight has a particle size of about 3 microns or less.
  • chabazite molecular sieve particles have a particle size distribution wherein at least about 90% by weight has a particle size of about 1 micron or less.
  • the fiber matrix wall flow filter can be coated with a chabazite molecular sieve iby any suitable technique.
  • the fiber matrix wall flow filter is coated with chabazite molecular sieve by immersion techniques.
  • the fiber matrix wall flow filter can be immersed vertically in a portion of a chabazite molecular sieve tslurry.
  • the top of the filter can be located just above the surface of the slurry. In this manner slurry contacts the inlet face of each honeycomb wall, but is prevented from Contacting the outlet face of each wall.
  • the filter can be left in the slurry for about 30 seconds.
  • the filter can be removed from the slurry, and excess slurry is removed from the filter first by allowing it to drain from the channels, then by blowing with compressed air (against the direction of slurry penetration), and then by pulling a vacuum from the direction of slurry penetration.
  • the catalyst sluriry permeates the walls of the filter, yet the pores are not occluded to the extent that undue back pressure will build up in the finished filter.
  • the term "permeate" when used to describe the dispersion of the catalyst slurry on the filter means that the catalyst composition is dispersed throughout the wall of the filter.
  • the resulting fiber matrix wall flow filter containing the chabazite molecular sieve SCR catalyst may be referred to as a SCR filter.
  • the coated filters can be dried and then calcined. In one embodiment, th ⁇ coated filter is dried at about 100 degrees Celsius and calcined at a higher temperatilire of about 300 degrees Celsius or more and about 450 degrees Celsius or less. After calcining, the catalyst loading can be determined by calculation of the coated and uncoated weights of the filter. Catalyst loading can be modified by altering the solids content of the coating slurry. In one embodiment, repeated immersions of the filter in the coating slurry can be conducted, followed by removal of the excess slurry as described above.
  • the coated filter can have any suitable concentration of chabazite molecular sieve SCR catalyst compositions to ensure that the desired NO x reduction and particulate removal levels are achieved and/or to secure adequate durability of the catalyst over extended use.
  • SCR catalyst compositions are deposited on the filter at a concentration of about 1 g/in 3 or more and about 3 g/in 3 or less.
  • SCR catalyst compositions are deposited on the filter at a concentration of about 1.2 g/in 3 or more and about 2.8 g/in 3 or less.
  • SCR catalyst compositions are deposited on the filter at a concentration of about 1.4 g/in or more and about 2.6 g/in 3 or less.
  • SCR catalyst compositions are deposited on the filter at a concentration of about 1.5 g/in 3 or more and about 2.5 g/in 3 or less.
  • FIGS. IA and IB illustrate a fiber matrix wall flow filter 100 which has a plurality of passages 102.
  • the passages 102 can be tubularly enclosed by the internal walls 104 of the filter substrate.
  • the filter can have an inlet end 106 and an outlet end 108.
  • Alternate passages can be plugged at the inlet end 106 with inlet plugs 1 10, and at the outlet end 108 with outlet plugs 1 12 to form opposing checkerboard patterns at the inlet 106 and outlet 108.
  • a gas stream 1 14 enters through the unplugged channel inlet 116, is stopped by outlet plug 1 12 and diffuses through porous channel walls 104 to the outlet side 1 18.
  • the exhaust gas cannot pass directly throughlthe filter without crossing the walls because of inlet plugs 1 10.
  • the fiber matrix wall flow filter can be catalyzed in that the wall of filter has thereon or contained therein one or more catalytic materials. Catalytic materials can be present on the inlet side of the element wall alone, the outlet side alone, or both the inlet and outlet sides.
  • FIGS. 2A and 2B are schematic diagrams illustrating systems for treating an exhalust stream containing NO x and particulate matter.
  • Figure 2A illustrates an exemplary emission treatment system 200A for treating an exhaust stream containing NO x and particulate matter using a SCR filter.
  • an exhaust 202 containing gaseous pollutants (including unburned hydrocarbons, carbon monoxide, and NO x ) and particulate matter is conveyed from an engine 204 to a SCR filter 206.
  • An oxidation catalyst (DOC) 208 can be optionally used between the engine 204 and the SCR filter 206.
  • the system 200A does not include an oxidation catalyst.
  • unburned gaseous, nonvolatile hydrocarbons (e.g., volatile organic fraction (VOF)) and carbon monoxide can be combusted to form carbon dioxide and water. Removal of substantial proportions of the VOF using the oxidation catalyst can help to mitigate a deposition (e.g., clogging) of particulate matter on the SCR filter 206, which is positioned downstream in the system.
  • a substantial portion of the NO of the NO x in the exhaust is oxidized to NO 2 in the oxidation catalyst.
  • Ammonia or ammonia precursor can be injected as a spray via a nozzle (not shown) into the exhaust stream.
  • aqueous urea shown on one line 210 serves as an ammonia precursor which can be mixed with air on another line 212 in a mixing device (MD) 214.
  • a valve 216 can be used to meter precise amounts of aqueous urea which are converted in the exhaust stream to ammonia.
  • the exhaust stream with the added ammonia or ammonia precursor is conveyed to the SCR filter 206.
  • the NO x component is converted to NO by the particulate matter (e.g., soot cake) trapped on the SCR filter, and then NO is converted through the selective catalytic reduction of NO with ammonia to nitrogen.
  • the particulate matter including the soot fraction and the VOF can be also largely removed by the SCR filter 206. In one embodiment, about 80 wt. % or more of the particulate matter is removed by the SCR filter. In another embodiment, about 85 wt. % or more of the particulate matter is removed by the SCR filter. In yet another embodiitnent, about 90 wt. % or more of the particulate matter is removed by the SCR filter.
  • the particulate matter deposited on the SCR filter 206 can be combusted through regeneration of the filter.
  • Figure 2B illustrates another exemplary emission treatment system
  • the emission treatment system 200B includes a slip oxidation catalyst 218 downstream of a SCR filter 206.
  • the slip oxidation catalyst 218 can contain a composition containing base metals and less than about 0.5 wt % of platinum.
  • the silip oxidation catalyst can be used to oxidize any excess NH 3 before it is vented to the atmosphere.
  • An oxidation catalyst 208 can be optionally used between the engine and the SCR filter.
  • Figure 3 illustrates an exemplary methodology 300 for reducing NO x concentration arid particulate matter in a diesel engine exhaust.
  • ammonia or an ammonia precursor is injected into a diesel engine exhaust.
  • the exhaust is passed through a SCR filter containing a fiber matrix wall flow filter and a chabazite molecular sieve SCR catalyst on the fiber matrix wall flow filter, the fiber matrix wall flow filter contajining a plurality of non-woven inorganic fibers.
  • the method further involves passing the exhaust through an oxidation catalyst before injecting ammonia or ammonia precursor into the exhaust.
  • the fiber matrix wall flow filter contains at least one of alumina fibers, silica fibers, mullite fibers, silicon carbide fibers, aluminosilicate fibers, aluminum borosilicate fibers, or combinations thereof.
  • the fiber matrix wall flow filter can have a coefficient of thermal expansion of about 1 x 10 "6 /degree Celsius or more and about 6 x 10 "6 /degree Celsius or less.
  • the fiber matrix wall flow filter can have a modulus of rupture strength of about 1,000 psi or more and about 2,000 psi or less.
  • the chabazite molecular sieve SCR catalyst comprises hydrophobic chabazite molecular sieve.
  • the chabazite molecular sieve SCR catalyst can contain metal exchanged chabazite molecular sieve.
  • the chabazite molecular sieve SCR catalyst contains at least one of Cu-exchanged chabazite molecular sieve, Fe-exchanged chabazite molecular sieve, or a combination thereof.
  • Example 1 shows evaluation of a back pressure for coated fiber matrix wall flow filters.
  • a fiber matrix wall flow filter having dimensions of 1 x 3 inches, an average pore size of 15 microns, and 67 % wall porosity is used to prepare a catalyst-coated filter.
  • a catalyst slurry is formed from copper-exchanged 3 % chabazite molecular sieve (containing 3 wt. % of copper based on the weight of the chabazite molecular sieve) and de-ionized water.
  • the catalyst is deposited on the fiber matrix wall flow filter by (1) dipping the filter into the slurry to a depth sufficient to coat the channels of the filter along the entire axial length of the filter from one direction; (2) air-knifing the filter from the side opposite the coating direction (e.g., the dry side); (3) vacuuming the filter from the ooated side; and (4) drying the filter at about 93 degrees Celsius for about 1 hour in flowing air, and calcining the filter at about 400 degrees Celsius for about 1 hour. Actions (1) through (4) are then repeated from the opposite side.
  • the resulting fiber matrix wall flow filter is designated as FMWFF. Pressure drop across of the resulting fiber matrix wall flow filters having three different catalyst loadings is shown in Table 1.
  • the first cordierite ceramic wall flow filter has dimensions of 1 x 6 inches, an average pore size of 18 microns, and 59 % wall porosity.
  • the Second cordierite ceramic wall flow filter has dimensions of 1 x 6 inches, an avertage pore size of 22 microns, and 65 % wall porosity.
  • the first and second cordierite ceramic wall flow filters are designated as CCWFFl and CCWFF2, respectively. Pressure drop across the cordierite ceramic wall flow filters is shown in Table 1 . [0071] Table 1
  • Example 2 shows evaluation OfNO x conversion and NH 3 conversion by a coated fibeir matrix wall flow filter and as a comparative example, a cordierite ceramic wall flow filter (e.g., a SCR filter).
  • FMWFF and CCWFF2 of Example 1 are used Both of the wall flow filter parts have dimensions of 1 x 6 inches
  • the SCR catalyst is deposited on both of the cordierite ceramic wall flow filter with a catalyst loading of 2 g/in 3 in the manner as described in Example 1.
  • Nitrogen oxides selective catalytic reduction (SCR) efficiency and selectivity of the fresh catalyst cores is measured by adding a feed gas mixture of 500 ppm of NO, 500 ppm of NH3, 10% O 2 , 5% H 2 O, balanced with N 2 to a steady state reactor containing a 1"D x 3"L catalyst core.
  • the reaction is carried at a space velocity of 40,000 hr "1 across a 150 0 C to 460 0 C temperature range.
  • the resulting NOx conversions are presented in Table 2.

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  • Combustion & Propulsion (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Inorganic Chemistry (AREA)
  • Catalysts (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Filtering Materials (AREA)
  • Processes For Solid Components From Exhaust (AREA)

Abstract

L'invention concerne des filtres à réduction catalytique sélective (SCR) qui fournissent de manière efficace un traitement simultané de matière particulaire et de NOx. Il est également proposé des procédés pour réduire la concentration en NOx et la matière particulaire dans un échappement de moteur diesel en utilisant les filtres SCR. Le filtre SCR peut comprendre un filtre de flux de paroi de matrice de fibre comprenant une pluralité de fibres inorganiques non tissées et un catalyseur SCR de tamis moléculaire de chabasite sur le filtre de flux de paroi de matrice de fibre. En combinant un filtre de flux de paroi de matrice de fibre avec un catalyseur SCR de tamis moléculaire de chabasite, on peut obtenir une charge de catalyseur élevée sans provoquer de contre-pression excessive dans le filtre lorsqu'il est mis en œuvre dans des systèmes de traitement d'émission.
PCT/US2008/055138 2007-02-27 2008-02-27 Scr sur substrats de filtre de faible masse thermique WO2008106518A2 (fr)

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EP08730850A EP2117681A4 (fr) 2007-02-27 2008-02-27 Scr sur substrats de filtre de faible masse thermique
JP2009551820A JP5592653B2 (ja) 2007-02-27 2008-02-27 低熱容量のフィルター基材上のｓｃｒ
CN2008800137327A CN101674876B (zh) 2007-02-27 2008-02-27 在低热质过滤器基底上的scr

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US60/891,835 2007-02-27

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KR20100014604A (ko) 2010-02-10
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JP6325024B2 (ja) 2018-05-16
JP2010519037A (ja) 2010-06-03
US20080202107A1 (en) 2008-08-28
EP2653220B1 (fr) 2016-12-07
US20110268635A1 (en) 2011-11-03
US10654031B2 (en) 2020-05-19
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JP5965501B2 (ja) 2016-08-03
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US9138732B2 (en) 2015-09-22
CN101674876B (zh) 2012-07-04
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US20130195731A1 (en) 2013-08-01
US20180056281A1 (en) 2018-03-01
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US9656254B2 (en) 2017-05-23
US20160101412A1 (en) 2016-04-14
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US20160101411A1 (en) 2016-04-14
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US8735311B2 (en) 2014-05-27
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US20140219879A1 (en) 2014-08-07
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US9839905B2 (en) 2017-12-12
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